Brainteaser

Today's brainteaser comes in the form of a riddle. Read the verse below and see if you can work out the answer.


I have no voice, yet I speak to you;
I tell of things in the world that people do.
I have leaves, but I am not a tree.
I have a spine and hinges, but I am not a door;
I have told you all, I cannot tell you more.


What am I?